#include <stdio.h>

int main()
{
	int n = 0;
	int x = 0;
	int y = 0;
	int rest = 0;
	scanf("%d %d %d",&n,&x,&y);
	if(y<=x*n)
	{
		rest =n- (float)y/x;
		printf("%d",rest);
	}
	
	
	return 0;
}
